Electric Pto Clutch; Purpose; Location; How It Works - Toro TimeCutter SW4200 Service Manual

ELECTRICAL

Electric PTO Clutch

Purpose

The clutch electrically controls the engagement and
disengagement of the Power Take Off (PTO) pulley.

Location

The electric clutch is located on the PTO end of the
engine crankshaft.

How It works

The PTO clutch is composed of three major compon-
ents; the field, clutch plate, and friction plate. The clutch
plate always turns with the engine. The field is a coil of
wire on an iron core, which becomes an electro magnet
when power is applied.
The friction plate is the only piece that can slide up and
down on the crankshaft axis. It is normally spring-loaded
so that it is not in contact with the clutch plate and is
pressed against the brake material opposite the clutch.
When power is applied, the friction plate is drawn toward
the clutch plate and the two rotate as one.
7
7-12

Testing

If the electric PTO clutch is not engaging or is sus-
pect ed as a cause of electrical problems, use the
troubleshooting steps. These procedures will help you
determine if the clutch has failed or is the cause of the
elec trical problem.

Coil Resistance Measurement

1. Disengage the PTO switch, turn ignition off and
remove key.
2. Disconnect clutch wire connector.
3. Set multimeter to check resistance (ohms).
4. Connect the meter lead wires to the terminals in the
clutch connector (Fig. 168).
Fig. 168
5. See the PTO Clutch Electrical Specifications chart.
PTO Ohms
Clutch Specification
A 2.84 + 10%
B 3.0 + 10%
Toro TimeCutter SW/SWX Service Manual
coil resist msmt_v2
Amp Draw Continuity
Specification to Ground
4.23A + 10% OPEN
3.97A + 10% OPEN